Thermophysical properties of Co–Si melts measured by an electrostatic levitation technique

Abstract

The density, surface tension, and viscosity of Co–Si melts have been measured using an electrostatic levitation technique. The density and surface tension of Co–Si melts can be expressed as a linear function of the temperature. The excess volume was obtained from the density results, and the composition dependence of the excess volume is discussed using thermodynamic functions, such as the enthalpy of mixing and excess Gibbs energy. The surface tension was compared with that calculated by the Butler model, and the effect of surface segregation on the surface tension is discussed. The relationship between the viscosity of Co–Si melts and the temperature can be reproduced by an Arrhenius function, and the activation energy in the flow is discussed using the excess stability.